qt - QSqlTableModel, QTableView change columns not updated -


i have sql model connects single table, table change number of columns depending on conditions during execution of program. model connected qtableview. have function controls number of columns @ end of function have call model->select(), update information of model , tableview->reset(), thought rearrange view adding or taking away columns. problem view not change original number of columns had. if reduce number can see data change , show empty on missing columns. there command tableview resize self? editing question in constructor of class i'm reading table , setting view:

  header = new qsqltablemodel(parent,data->m_db);   header->settable("c"+qstring::number(marktime.tosecssinceepoch())+"t");   header->select();   ui->heading->setmodel(header);   ui->heading->show();

every time that number of columns changed sql procedure change number of columns:

void importprocess::copytable(qstring oldtable, qstring newtable) {   qsqlquery queryold, querynew;   queryold.prepare("select * :oldtable");   queryold.bindvalue(":oldtable",oldtable);   queryold.exec();    if(queryold.record().isempty()==true) return; //old table empty, nothing copy    int oldcolumn=queryold.record().count();    qstring replaceline="insert "+newtable+" values(";   while(queryold.next()==true)     {       replaceline.append(qstring::number(queryold.value(0).toint()));       replaceline.append(", "+queryold.value(1).tostring());       for(int y=0;y<(oldcolumn < ui->columns->value() ? oldcolumn : ui->columns->value());y++)         {           replaceline.append(", "+qstring::number(queryold.value(y+2).tofloat()));         }       replaceline.append(")");       querynew.exec(replaceline);     } }

then header file updated, , here thought tableview redrawn:

void importprocess::updateheadingtable() {   qsqlquery query;   query.exec("delete c"+qstring::number(marktime.tosecssinceepoch())+"t");   qstring description= ui->week->ischecked() == true ? "week" : "size";   query.exec("insert c"+qstring::number(marktime.tosecssinceepoch())+"t (id, description) values (101, '"+description+"')");   for(int x=0;x<ui->columns->value();x++)     {       query.exec("update c"+qstring::number(marktime.tosecssinceepoch())+"t set col"+qstring::number(x)+" = '30'");     }   header->select();   ui->heading->reset();  }

i believe forgot protected methods:

void qabstractitemmodel::begininsertcolumns(const qmodelindex &parent, int first, int last); void qabstractitemmodel::beginremovecolumns(const qmodelindex &parent, int first, int last); void qabstractitemmodel::endinsertcolumns(); void qabstractitemmodel::endremovecolumns();

every time number of column change should call first or second method. after change should call third or fours method.

you can read these methods in qt documentation.


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